Focusing mechanism.



C. E. GGDLEY.

FOCUSlNG MECHANISWI.

Awucmoa man Dsc. so. 191s.

Patentedjunfe 5, 19T?.

` 55 MQAMLSX. 3555 MMSS@ lll mi' .Vivid ii l-ARLES E. @UBL-1321.". OF DETROIT, IvCHG-AN, SSIG-IIOR C6133? QREION,

GF DETRIT, MICHIGAN, A CQRPRATIGN E NEW' ann Jonas 'roi-iii.

TO EBMUNDS :Focusrite Mnoimiis'iu.

Specification of Letters Patent.

.Application filed December 3G, 1918. Serial No. 139,915.

To @ZZ 'ffwm t amy concern.'

ll known that 1,' CHARLES E. Gonnini', a citizen of the United t'itates, and residing at Detroit, in the county of l/Vayne and State 5 of li/lichigan9 have invented a new and lmproved Focusing' Mechanism, of which the following is a specification.

l This invention relates to means for 'focusingl electric light bulbs within the reflectors of lamps of the automobile-headlight type, and its object is to produce a device of this hind that is completely detachable, that may be quickly and easily installed without the.

` support adapted to hold the focusing device in central position by engaging theinner `walls of the boss on the lamp casing, a screw carried by the support and having a head which is revolubly mounted in a perforation in the cent-er of the boss. and a bar slidably mounted on the support, one end of the bar connected to the lamp-bulb socket and the other beine turned up and fitted to receive fhe adjusting screw. 1t further consists in the resilient means AFor guiding' said bar on the. suppport and in the details of construction illustrated in lhe aecon1paiivine drawings and particularly pointed out in the claims.

in the aceompauyin-g drawing, Figure 1 is a central longitudinal section of a lamp equipped with this improved focusing device. Fig'. 2 is a side elevation oi the focusing device and Fig. 3 is a. front elevation of the rear end thereof. Fija'. @i is av bottoni plan view of the sleeve ou the reflector.

Similar reference, characters re'f'er to like parts throughout the several views.

rlhe lamp body or casing l, having' a boss 2 spun onto its rear end. the reflector 3 having a r frwardly extending' cylindrical sleeve 4, the door ringo, the lens 6 and the cork cushion 7 back of it, and the bulb 8 forni no part of the present iuvention.- Slidable in the sleeve 4 is a lamp-suchet i) having' `terminals 10 to connect to the circuit wires for 1he lamp. he sleevel i is termed with a notch l1 in its lower side to permit thc bar Yfrom a resilient sheet of vdevice toivard each other, the

12, whichv is connected to the socket S, to slide back and forth. rilhe socket is longif tudinally slidable in the sleeve et :uid is prevented from turning' by the bar l2 fitting in the notch 11.

The supportingx means for the rear end of this ,focusing device is preferably formed metal and consists of the tivo connectedside members oi' arms and thebottom mein' er 16 Which is provided with upwardly V.tending flanges 17 which prevent the bar 12 from moving laterally. The bai' rests on the bottom 16 and .may be pressed against this bottom by means of a resilient wire clip 18, as shown in Fig. 3. 7 lThe two arms 15 are so formed that they will fit within the boss 2 on the Patented June 191 p casing and be held firmly in position therein.A

It will be noticed that the casing is formed with an internal rib or bead at the line of connection between the boss and the main part of the casing' behind which certain shoulders formed by bending the arms 15 engage to hold this resilient support in position. Because of' this peculiar conformation of the support and of the interior of the casing, the middle part of the support is pressed rearwardly toward the middle portion of the boss.

The adjustingy member oi this device con- Asists of a flat bar which is twisted to constitute a screw 2O of very coarse pitch which extends through a slot in 21 of the bai' 12. A small pin QQ'prevents the screw disengaging from the end of the bai'. On the rear end of thescreiv is a head 23 having a reduced portion 21 that is journaled in a hole in the supporting' member and a. second reduce l portion that is ournaled in an aperture in the center of the boss This head is preferably provided with a notch 26 to receive a flat tool or the edge of a small coin by means of which the screw may be turned and the lamp-bulb moved in or out relative to the reflector as desired.

B v removing' the reiiector the ends of the parts 15 of the supporting focusing' device can be entirely removed from the lamp casing. The pressure normally exerted be tween the head 23 and the boss on one side and the spring on the other side is sullicient to keep the screw from being turned by the the uptui'ned end f and pressi ng jars and jolts of the vehicle on which the lamp is mounted. No rivets or screws are necessary to hold the parts in position, which reduces the cost of assembling this 45 structure vto a minimum.

the reflector may be inserted without attention to its angular position.

-1 I- claim 1. In a focusing device for a lamp having a casing and a reflector mounted therein, a lamp socket slidable in the reflector, a

screw revolubly mounted in the casing, a spring to hold the screw in position formedv from a flat piece of resilient metal bentto, fit the casing and provided with a hole to l 20 permitj-the screw to pass through it, and

means engaging the vscrew and socket to permit the screw to focus the lamp bulb.

2."In a focusing device, the combination of a cup-shaped lamp casing and a reflector mounted therein, a cylindrical guide projecting rearwardly from the reflector, said casing being formed with a boss opposite the open end, a resilient support withiny f the boss, a screwcarried by the support, a bulb-socket vslidable in the guide on the rehector, and a bar connected to, the socket and having an upturned end engaged by thrl screw. l

3. In a focusmg device, the combmation -15 of a cup-shaped lamp casing having arboss opposite its opening, said boss being `pro vided with a circular hole, a reflector mountedin the casing and provided with a cylindrical guide, al bulb-socket slidahle 4o in said guide, a rearwardly extending bar connected to said socket and having its rear end upturned to cross the central line of the reflector and socket, said guide having a notch to receive the forward end ofl said 'bar to prevent the socket from turning, and

a screw having a head revoluble inthe holei in theboss and a body engaging with the npturned end of the bar.

4. In a .focusmg device, the combination of, a cup-shaped lamp casing having a boss opposite its opening, said' boss bemg provided with 'a circular hole, a reflector mounted' in the casing and provided witha 'cylindrical guide, a bulb-socket slldablem saidV guide, a rearwardly extending bar connected to said socket and having its rear. end u turned to cross the central line of the re ector and socket, said guide having a notch to receive the forward end of said bar tdprevent the socket from turning, a

screw having a head revoluble in the hole in theboss and a body engaging with the upturned endV of the bar, and resillent means detachably mounted within said boss to support said bar and hold the head of said screw in position in said'hole.

5. In a focusing device, the combination of a cup-shaped lamp casing having a bossoppositeits opening, the casing having a rentrant bead at the line of attachment of the boss to the main part of the casing, a cup-shaped reflector mounted yin the casing and having an opening in its rear end, a lamp-bulb'socket 'slidable in said opening in the rear end ofthe reflector, a bar con-v nected to said socket, a focusing screw engaging said bar to move it longitudinally, :india resilient supportfor the bar and 'screw having 'members `engaging said reentrant bead to hold the parts in position;

6. In a focusing device, the combination of a lcup-shaped lamp 'casing having in.- Wardly extending projections, a reflector mounted inthe casing and'provided with an -opening in itsrear end, a lamp socket slid-able in said opening in the yreflector, a

resilient support detachahly engaging the projections on the casing, and an adjustable connection between the support and the socket to move thel socket longitudinally.

7. In a focusing device, the combination socket 'slidable in said hole in the reector,

a rearwardly extending bar connected to the socket and having an upturned end provided with .an elongated hole, a helically twisted rod extending through said hole and adapted to move the bar back and forth when turned, a head on said screw revolubly mounted in the hole in the boss, a resilient supporting member having oppositely extending arms engaging the rib in the casing and engaging'the head on the screw at the juncture ofv said arms to press the head intoV the holexin the boss and also having a bottom portion extending 'forwardly to form a support for the rear end -of the bar, the edges of the bottom being bent up to form guides for the bar, and resilient means to hold the bar'v in position between said guides.

. CHARLESE. GODLEY.

of a cup-shaped lamp casing provided withl 

